/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.coders;



import com.bff.gaia.unified.sdk.util.CoderUtils;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ImmutableList;

import org.xerial.snappy.Snappy;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.List;



/**

 * Wraps an existing coder with Snappy compression. It makes sense to use this coder only when it's

 * likely that the encoded value is quite large and compressible.

 */

public class SnappyCoder<T> extends StructuredCoder<T> {

  private final Coder<T> innerCoder;



  /** Wraps the given coder into a {@link SnappyCoder}. */

  public static <T> SnappyCoder<T> of(Coder<T> innerCoder) {

    return new SnappyCoder<>(innerCoder);

  }



  private SnappyCoder(Coder<T> innerCoder) {

    this.innerCoder = innerCoder;

  }



  @Override

  public void encode(T value, OutputStream os) throws IOException {

    ByteArrayCoder.of()

        .encode(Snappy.compress(CoderUtils.encodeToByteArray(innerCoder, value)), os);

  }



  @Override

  public T decode(InputStream is) throws IOException {

    return CoderUtils.decodeFromByteArray(

        innerCoder, Snappy.uncompress(ByteArrayCoder.of().decode(is)));

  }



  @Override

  public List<? extends Coder<?>> getCoderArguments() {

    return ImmutableList.of(innerCoder);

  }



  @Override

  public void verifyDeterministic() throws NonDeterministicException {

    innerCoder.verifyDeterministic();

  }

}